The background tab contains settings for background components under regions.
It affects the the polynomial background, the step under peak centroid as well as the long background tail on the low-energy side of the peaks.
Polynomial background components
Background level enabled
Zeroth order component of polynomial background function. Almost always fitted. Default value is Enabled.
Background slope enabled
First order component of polynomial background function. Default value is Enabled.
Background curvature enabled
Second order component of polynomial background function. Default value is Enabled.
Background step
Background step enabled
Step function which jumps under the peak centroid. Default value is Enabled.
Background tail
Background tail enabled
If enabled, peak evaluator tries to fit a long, skewed background function under the low energy side of the peak, which also contributes to the fit also far away from the peak centroid. As this phenomenon is observable mainly for older detectors only, it is disabled by default. The bigger is the tail, the less is the area of the peaks in the region. Default value is Disabled.
Tail amplitude minimum
Lower limit of tail amplitude, relative to peak amplitude. Default value is 1e-10; should not be less than this value.
Tail amplitude maximum
Upper limit of tail amplitude, relative to peak amplitude. Default value is 0.015; should not be higher than this value.
Tail slope minimum
Lower limit of tail slope. Default value is 2.5; should not be less than this value.
Tail slope maximum
Upper limit of tail slope. Default value is 50.
Tail slope initial value
Value of tail slope used initially when starting a region fit. Must be between Minimum and Maximum values. Default value is 2.75.
